Derrick



(N Model.)

D. SHARP.

DBRRIGK. No. 322,756. Patented July 21, 1885.

NITED STATES PATENT Orrlci DAVID SHARP, OF LEMOORE, CALIFORNIA.

DERRICK.

SPECIFICATION forming part of Letters Patent No. 322,756, dated July 21, 1885.

Application filed January 5, 1885.

To all whom, it may concern.:

Be it known that I, DAVID SHARP, of Lemoore, county of rIulare, and State of California, have invented an Improvement in Derricks; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to the class of derricks and to certain new and useful improvements therein 5 and my invention consists in a sliding frame moving on the main frame and carrying the pivoted mast, in a vertically-adjustable roller upon which the mast is adapted to rest and by which it is guided in raising and lowering as the sliding frame travels, and in a novel connection between the outer end of the boom and the top of the mast, all of which I shall hereinafter fully explain.

The object of my invention is to provide a derrick of simple construction and adapted to be easily operated.

Referring to the accompanying drawing, the figure is a perspective view of my derrick.

A is the main frame of the wagon mounted on wheels B.

G is the sliding frame mounted on the side sills of the main frame by means-of thehangers c and rollers c', one set of rollers traveling on top of the sills, and the other set bearing under the sills, whereby the frame C is held to its place, and is adapted to be moved back and forth on the main frame.

D is the mast, having a cross-base, d, the

. ends of which are journaled in the sides of the sliding-frame G, whereby said mast is carried by the frame, and is adapted to be raised or lowered.

Upon the rear end of the wagon A are standards E, having vertical slots or grooves e, in which are set the boxes f, which carry the roller F. Set-screws f fix the boxes f wherever adjusted.

l? is a block and tackle, by which the sliding frame C, after having been moved forward, is drawn back.

The operation of raising and lowering the mast is as follows: To lower it the line of the block and tackle l? is paid out, and the operator moves the frame C forward. The mast, which of course has been previously freed of its guys, is allowed to fall back until limited by roller F. The continued movement of frame G, carrying the lower end of the mast (No model.)

adjustable is to-allow it to be brought into conp venient relation to the mast to receive said mast as it is let down, and also to lower it to an approximately horizontal position when not in use. v

Fixed to the top of the mast is a rod or spindle, G, to the top of which is secured a .cross-rod, H, carrying rings h, to which, and

to a ring, h', on the spindle G, are secured the guy-ropes I.

J is a bar having a central socket, by which it is pivoted on the spindle G. It rests on a collar, g, on said spindle, and is adapted to be turned thereon. To the ends of the bar J are secured two links, j, to the meeting ends of which is attached a block, K.

L is the boom secured to the mast and adapted to move up and down thereon by means of the usual ring, l.

The rope M is attached to the end of the boom, and thence passes up to and around the block K, and down to within reach, whereby the outer end of the boom is supported from the bar J, and is raised or lowered.

N is the usual block and tackle for supporting and operating the inner end of the boom.

O is the rope of the hay-fork.

It will be seen that the bar J, mounted on the spindle G, forms the support or turn-table for the boom, whereby it may be moved to any desired position.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a derrick, a sliding frame adapted to move upon the main frame or wagon, and carrying the pivoted mast, and an elevated rest or guide secured to the main frame and adapted' to receive and direct the mast to raise or lower it as the sliding frame is moved, substantially as herein described.

2. In a derrick, a sliding frame adapted to To raise it the move upon the main frame or Wagon, and carrying the pivoted mast, and a roller supported by the main frame and adapted to receive and direct the mast to raise or lower it as the sliding frame is moved, substantially as herein described.

3. In a derrick, the main frame A, and the roller F, mounted at one end of the frame, in combination with the sliding frame C, adapted to travel on the main frame, and the mast D, pivoted to and carried by the sliding frame, substantially as herein described.

4. In a derrick, the main frame A, and the vertically-adjustable roller F, mounted at one end of the frame, in combination with4 the sliding frame C, adapted to travel on the main frame, and the mast D, pivoted to and carried by the Sliding frame, substantially as herein described.

5. In a derrick, the main frame A, and the vertically-adjustable roller F at one end, in

combination with the frame C, having hangers c and rollers c', by Which it is adapted to travel on the main frame, the block and tackle l?, by which the sliding frame is operated, and the mast D, pivoted to and carried by said frame, substantially as herein described.

6. In a derrick, the mast D, having the spindle G in its top, the cross-rod H on top of the hand.

DAVID SHARP.

Witnesses:

W. S. CUNNINGHAM, GHAs. G. LAMBERsoN. 

